Turn your Instant Pot on and to the saute function. Pour in the quinoa and stir frequently for 5 or 7 minutes. The quinoa will become very aromatic. Pour in the liquid, stir in the salt and then lock on your lid and place toggle on sealing. Use manual setting for 12 minutes. Let natural release take place. Turn cooked quinoa into a large bowl to cool.
Place all veggies in the bowl with the cooled quinoa and stir well.
Mix all the dressing ingredients in a blender or food processor until they are well-emulsified. Pour over the rest of salad and mix gently. Salad can be served immediately but gets better the longer it sits. Top with crumbled feta cheese, if desired, or serve from a nearby bowl for those who would like to add the salty and savory punch that feta imparts.